Add flexible SSH directory mounting

[fletchgqc]

• Mount ~/.claudebox/ssh read-write when it exists for persistent SSH state
• Fall back to ~/.ssh read-only for backwards compatibility
• Documentation with setup instructions for dedicated ClaudeBox SSH keys

Summary by Sourcery

Enable flexible SSH key mounting by preferring a dedicated ~/.claudebox/ssh directory with read-write access and falling back to ~/.ssh as read-only, and update documentation with setup instructions

New Features:

• Add support for mounting ~/.claudebox/ssh into containers as a read-write directory for persistent SSH state

Enhancements:

• Fallback to mounting the user’s ~/.ssh directory as read-only when no ClaudeBox SSH directory exists

Documentation:

• Add README section explaining SSH directory configuration and setup for ClaudeBox keys

[sourcery-ai]

Reviewer's Guide

This PR enhances SSH key management by detecting a dedicated ClaudeBox SSH directory for read-write mounting in the container, falling back to a read-only ~/.ssh mount for backwards compatibility, and updates the documentation to describe this behavior with setup instructions.

File-Level Changes

Change	Details	Files
Implement conditional SSH directory mounting logic in the Docker launch script	Remove hard-coded read-only ~/.ssh mount Add check for non-empty $CLAUDEBOX_HOME/ssh and mount it read-write Fall back to mounting $HOME/.ssh read-only when custom directory is absent Include verbose debug logging for each mount decision	lib/docker.sh
Add documentation for flexible SSH key configuration	Include ~/.claudebox/ssh in storage overview Explain recommended read-write ClaudeBox SSH directory and read-only fallback Provide shell commands to create the directory, set permissions, and generate keys	README.md

Possibly linked issues

• #123: The PR addresses the issue by documenting SSH key mounting, providing a dedicated ~/.claudebox/ssh directory, and clarifying ~/.ssh read-only fallback.

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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